I mean, relationships are fluid and build gradually, and rarely start overnight... So how did you choose which day to list as your 'start date'? The day you moved in together? The day you became exclusive sexual partners? The day you started introducing each other to your family and friends? The day you married and got a ring?
I'm dithering between choosing the day we moved in together or the time period where we started publicly recognizing each other as partners. They are a few months apart, though either start date will be sufficient for us to meet the 12-month minimum benchmark for residence. Probably not going to go into the morbid details of our sexual relationship (I assume we wouldn't have to mention that at all if we prefer, since there can be no 'proof' of it anyway?), and we won't be marrying anytime soon.
Suggestions?